Receiving apparatus.



H. SHOBMAKBR. BBGEIVING APPARATUS.

APPLIOATION FILED APB. 28, 1905.

VITISSES ,0MM

' Patented 1111531.19119.

AUGRIEY UNITED eiwrire HARRY SHEHAKEB, F JERSEY CITY, NEW .'TERSEY, ASSIGN'GR T0 INTERNATIONAL TELEGRAPH ONSTEUGTION UOHPANY, CORPORATION 01?' NEW' YORK..

RECEIVING APPARATUS.

Specification of Letters Patent.

Patented nog. $1. 1909.

Application Elec April 28, 1905. Serial No. 257,834.

To all 'whom it my concern:

Be it known that I, Henny Si-roeMAKnn, a citizen of the United States, residing et Jersey Cit ,4 in the county of Hudson and 6 State of ew Jersey, have invented n new and useful Receiving Apparatus, of which the following is e specification.

My invention relates to the apparatus employed at a receiving station of eSignal- 10 ing system wherein the signals or messages are represented during transmiesion by electro-radiant energy, as elecfrodnognct-ic waves or Hertzien. Waves. f Y The object of my invention is to provide receiving,r apparatuewhicli shall be highly selective of theelectrodndiunt energy emitted at a, certain transmitting station or stations, to the excluion of other electro-radiant venergy which may be in existence ut the same 2o time.

My inventionresides in circuit arramge ments and disposition of parts hereinafter described and pointed out in the claims.

For an illustration of one of thc forme my //i1ivenlion may take. reference is to be lnnl to the accompanying drawing, in which Figure 1 1s s, diugrannnatic View of the circuits of receiving apparatus for procuring selectivity. Fig. 2 illustrates a looped aerial conductor of a plurality of wires or conductors.

In Fig. l, A and A constitute a looped aerial conductor. Between A and the omlli connection E are connected the WaVc-resonsive device W und the noodweer Ii. In s unt to the 'waveesponsive device `W Vis connected the telephone receiver or other device T as hereafter described. The leg .A is shown iis-connected directlyto earth at 40 E. An inductance or length of col'iductor L is joined al. its one end to the base olf the leg A and has its outer end free. The rider a adjusts the amount of conductor orinductance L iii the local circuit formed by the wavelresponsiye device W, inductunce' L, und the condenser K. The rider a is also connected to the leg A. Obviousl the eantb connection E muy be oxnitte and the single earth connection E employed.. By v suitably adjusting the rider; a. the apparatus becomel highly selective of the electro! exist. 66

As shown in Fig. l, no local battery is employed, the detector "W beingf a Primary cell detector or other detector requiring no local battery. lf a weiteres )enerve device of type requiring a loool altcry ein 60 ployed, euch lot-ul battery would be included in or aesoeinted n'itll the shunt circuit including tl'ie telephone receirer or other device T.

In Fig. i?, the looped aerial coiuinctor is elioufn ne consisting of the legs A und A encli consisting o'la plurality of wires or conductors.

fluitl claim ie:V

1. In receiving apparatus, a looped aerialV 70 conductor, a wovemcsponsive device con? nected in one leg of the loop, an adjustable inductelicc bridging tbe legs of the loop, n condenser connected with said wave-respon- .liivc device and seid intlurtameiu o closedl loiul circuit.` und u signal reproducing means controlled by #aid wnvc-reeponsive devicmv 2. ln ,receiving apparatus, a looped aeriull conductor, :in ndiustuble inductuncc bridging y lhe'legs ci the loop, a wavoresponive de- 80 vice conl'iccted in n circuit in shunt to'suid indnctnncc -end in.V n leg of the loo i, a. .signal reproducing means controllc by seid,` wave--rceponsive device. y ,i 7 j f 3. in receiving appnrntus. u looped aerial 85 coinlnclor, an adjustable indi'u'tance having one terminal directly connected withy one le und the other terminal directly conuectle with the other leg ofthe loop, and a circuit in shuntto said inductance including a wave-responsive device. v

4. In receiving apparatuqa looped aerial conductor, 'a wave-responsive device cnnnectcd between one leg of the loopL and earth,

e connection from the other leg of the loop to earth, and an udiustable inductanqe mate their inwonende. L..

.5. In receivingfflpparotus, a looped nei-inlv conductor, e wa'vefresponsive device `and condenser serially, connected between a leg of said loop angl earth, a connect-ion from bridged across the legs of seid loop approxithe other leg of said loop to earth, and an and fm adjustable linducmnce brdged di; adjustable mdootanee bridgedv across the rectly across the legs of said loop. legis?" of said loop'approximate their lower HARRYSHOEMAK'ER en Y 6. In receiving apparatus2 a, looped aelfa-l Wituessesi V conductor, a wave-responslve device con- Em'ru N. BAHN, nebted between one leg of the loop and earth, BERTHA C. STEIN. 

